Telepresence system, telepresence method, and video collection device

1. A telepresence system, comprising: a video collection device, configured to collect images on a local end; an audio collection device, configured to collect audios on the local end; a video display device, configured to display images from a remote end; an audio player, configured to play audios from the remote end; an audio and video communication device, configured to transmits the images collected by the video collection device on the local end and audios collected by the audio collection device on the local end to the remote end through a network, wherein the video display device comprises a projection screen and at least one projector configured to project the image of the remote end to the projection screen; a background disposed behind the projection screen, wherein the projection screen is a semi-transparent projection screen or a transparent projection screen, so that the background is visible through the projection screen; the system further comprises a transparent optical conduction component, the transparent optical conduction component has an optical redirection area covering the projection screen; and the video collection device is configured to photograph the images reflected by inner surface of the optical redirection area.

2. The system of claim 1 , wherein the video collection device is a panoramic camera, and the system further comprises an image mosaics unit which is configured to splice narrow images photographed by the panoramic camera from different perspectives into a broad panoramic image.

3. The system of claim 2 , wherein: the transparent projection screen is a holographic transparent projection screen, and the panoramic camera is configured to capture the images transmitted via the holographic transparent projection screen.

4. The system of claim 3 , wherein: the system further comprises a synchronizing unit, configured to output synchronization signals to control the panoramic camera and the projector to work alternately.

5. The system of claim 1 , wherein the inner surface of the optical redirection area adopts holographically derived grating.

6. The system of claim 2 , wherein: the video display device comprises the project screen and at least one projector, and the system further comprises a linear polarizer which is placed in front of the projector and a lens of the panoramic camera; and a polarization angle of a polarizer of the projector is different from a polarization angle of a polarizer of the panoramic camera.

7. The system of claim 1 , wherein the audio player is at least one speaker array, the audio and video communication device is further configured to receive remote audios and remote attendee location information transmitted by the audio and video communication device on the remote end, wherein the location information is detected by the audio and video communication device on the remote end through the audio collection device on the remote end; the speaker array is configured to select one or more speakers closest to the remote attendee displayed on the projection screen to reproduce a sound field for received audios.

8. The system of claim 1 , wherein the audio collection device is at least one microphone array, the microphone array is configured to collect audios on the local end, calculate out location information of a speaking attendee by utilizing an audio positioning algorithm, and output attendee location information to the remote end through network.

9. The system of claim 2 , wherein: the system further comprises a black backdrop and a background projector, and the background projector works alternately with the panoramic camera under control of the synchronizing unit of the system, or the system further comprises a background monitor placed behind the attendee, and the background monitor works alternately with the panoramic camera under control of the synchronizing unit.

10. The system of claim 2 , wherein: the system further comprises a background projector, the linear polarizer is added in front of the background projector and the lens of the panoramic camera respectively, and the polarization angle of the polarizer of the background projector is different from the polarization angle of the polarizer of the panoramic camera.

11. The system of claim 2 , wherein: the system further comprises a background monitor placed behind the attendee, the linear polarizer is added in front of the background monitor and the lens of the panoramic camera respectively, and a polarization angle of a polarizer of the background monitor is different from the polarization angle of the polarizer of the panoramic camera; or the system further comprises a Liquid Crystal Display (LCD) placed behind the attendee, the linear polarizer is added in front of the lens of the panoramic camera, and a polarization angle of light emitted by the LCD is different from the polarization angle of the polarizer of the panoramic camera.

12. The system of claim 1 , wherein: the system further comprises a stereoscopic camera and an auxiliary display device, the audio and video communication device transmits three-dimensional (3D) videos collected by the stereoscopic camera on the local end to the auxiliary display device on the remote end through the network for displaying.

13. The system of claim 1 , wherein: the system further comprises an image correcting/blending unit; the image correcting/blending unit on the local end is configured to perform geometrical correction and edge blending for the images transmitted from the remote end; and the images that have undergone the geometrical correction and edge blending are displayed through the video display device on the local end.

14. The system of claim 13 , wherein: the display device comprises two or more projectors, the image correcting/blending unit is further configured to split the panoramic image into images whose quantity is equal to the quantity of the projectors, and output the split and processed images to the projectors respectively for displaying.

15. The system of claim 1 , wherein: the audio and video communication device receives remote attendee location information transmitted by the audio and video communication device on the remote end, wherein the location information is detected by the audio and video communication device on the remote end through the audio collection device on the remote end; and the audio player reproduces a sound field for received audios according to the location information.